Apps similar to Patronum include BetterCloud. It's paid, but Email Signature by about.me and Signery are free. Other options are SignatureSatori, WiseStamp, NEWOLDSTAMP and MySignature. You can choose from more than 10 Email Marketing Services like Patronum for the web, Windows, Mac, iPhone and Chrome OS.
BulkSignature is a Google Marketplace App created for the purpose of making company-wide email signatures easier. It fully integrates with your company on G-Suite Admin Console.
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Shared contacts, user management and administration tool, single sign-on, password and email signature management, directory search and multi-language support.
Ancoris Signatures provides centralised signatures management for Gmail, part of G Suite. You can stay in control of your domain wide email signatures and ensure all your employees adhere to company policy and reflect your brand correctly.
